XL or variants may stand for: Arts and entertainment XL Recordings, a British independent record label XL, a character in the animated series Buzz Lightyear of Star Command Businesses and organiza
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925c3bb2777b3f0e1c4bc9fb2c40f3bb65edcc23c6c8b24972e24bc572ea491c. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6cce3fa-c33b-43d1-8515-5d49e5558991.json and https://artists.proofprofile.net/proofs/artist/a6cce3fa-c33b-43d1-8515-5d49e5558991.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).